Electrochemical characterization of passive film and corrosion in Co-rich high entropy alloys in Ringer's solution

被引：2

作者：

Lee, Moonkyu ^{[1
]}

Zakiyuddin, Ahmad ^{[2
]}

Lee, Kwangmin ^{[1
]}

Park, Chan-Jin ^{[1
]}

机构：

[1] Chonnam Natl Univ, Sch Mat Sci & Engn, Gwangju 61186, South Korea

[2] Univ Indonesia, Dept Met & Mat Engn, Java 16424, Indonesia

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 32卷

基金：

新加坡国家研究基金会;

关键词：

High entropy alloy; Corrosion behavior; Passive film; Sigma phase; Cr and Mo depletion; MECHANICAL-PROPERTIES; STAINLESS-STEEL; IMPEDANCE SPECTROSCOPY; BEHAVIOR; MICROSTRUCTURE; COCRFENIMOX; ACID; MOLYBDENUM; MO; RESISTANCE;

D O I：

10.1016/j.jmrt.2024.07.174

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the corrosion characteristics of Co30Cr20Ni20Fe20Mo10 (Co30HEA), Co40Cr20Ni15Fe15Mo10 (Co40HEA), and Co50Cr20Ni10Fe10Mo10 (Co50HEA), designed as Co-rich high entropy alloys, compared to 316 L stainless steel and L605. Co30HEA has a single FCC phase, whereas the other two alloys exhibit a dual phase of FCC + (Cr, Mo) sigma phase. The presence of high Cr and Mo content in the sigma phase results in Cr depletion zones. Co30HEA shows the highest corrosion resistance in Ringer's solution, which diminishes with increasing Co content. Its passive film exhibits ideal capacitive behavior at low frequencies, indicating strong passivation. The films, primarily composed of Cr oxides and hydroxides, vary in thickness, with Co30HEA having a film about twice as thick as the others. All three alloys demonstrate pitting corrosion; however, Co30HEA shows the smallest pits mainly at grain boundaries, while the others show pits near the sigma phase due to unstable passive films in the Cr and Mo-depleted zones, acting as anodic sites for galvanic corrosion.

引用

页码：649 / 660

页数：12